add containerized flask demo via cog

[afiaka87]

Hey! I'm Clay from replicate.com. Really exciting model - thanks so much for releasing the weights! Hopefully this sort of tech can be a little more accessible to those without the means to use OpenAI's API.

I added support for cog so that others can dockerize and serve this themselves. Further, people should be able to run on replicate using the deployed container.

Claim your page here so you can edit it, and we'll feature it on our website and tweet about it too.

Thanks - and let me know if the PR needs any changes.